JPH0444680Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to the structure of a split type boom of a long attachment for a hydraulic excavator.

Prior Art FIG. 7 is a side view of a hydraulic excavator equipped with a long attachment. In the figure, 1 is a hydraulic excavator, 2 is an upper rotating body of the hydraulic excavator 1,
3 is the lower running body, 4 is the long attachment, 5
is the main boom of the long attachment 4, 6 is the first relay boom, 7 is the second relay boom, 8 is the front boom, 9 is the crusher arm, 10 is the crusher which is a working tool, 11 is the boom cylinder, 12 is an arm cylinder. FIG. 8 is a side view of the hydraulic excavator 1 with the first relay boom 6 and the second relay boom 7 of the long attachment 4 shown in FIG. 7 removed.

A prior art boom structure will be described with reference to FIGS. 7 and 8. A hydraulic excavator 1 used for high-altitude work such as demolition of a building has a long attachment 4 attached to the front part of an upper revolving body 2. A main boom 5 is pivotally attached to the lowest part of the front attachment 4, first and second relay booms 6 and 7 are connected to the upper tip of the main boom 5, and an arm 9 and a crusher are connected to the tip of the main boom 5. Machine 10 is installed. Then, the main boom 5, the first
The relay boom 6, the second relay boom 7, and the front boom 8 are connected to each other in a substantially straight line because the shortest length is set to suit high-altitude work. When working in low places, the first and second relay booms 6,
7 is removed and the front boom 8 is directly attached to the tip of the main boom 5, the main boom 5 and the front boom 8 are almost on a straight line as shown in FIG.

Note that when the boom cylinder 11 is telescopically operated, the long attachment 4 performs a raising and lowering operation, so that the inclination angle of the long attachment 4 changes. The arm cylinder 12 is installed on the lower surface side of the front boom 8, and when the arm cylinder 12 is extended or retracted, the angle of inclination of the arm 9 changes.

Problems that the invention aims to solve Hydraulic excavators are used for high-altitude work such as building demolition by attaching a work tool to a long attachment, or for excavating work at another work site. In this case, even if the split main boom and front boom of the long attachment are directly connected, it will be straight, and the arm cylinder cannot be attached to the top of the front boom, so it is not possible to use it for a backhoe boom. I couldn't do that. Therefore, during excavation work,
As shown in Figure 9, the boom 13 for a backhoe was being replaced, which was bent into a dogleg shape. Therefore, the split type boom for the long attachment was left idle and was uneconomical.

This invention solves the above-mentioned problems and provides a boom structure that allows a split boom for long attachments to be used for a backhoe.

A joint boom, arm, and work tool are sequentially connected to the front part of the hydraulic excavator so as to be rotatable in the front and rear directions, and the joint boom is connected to the main boom on the proximal side and one or more relay booms. , a boom structure formed by fixedly connecting a front boom on the tip side in a substantially straight line, and also having brackets for mounting a hydraulic cylinder on the upper and lower sides of the front boom, respectively, A pin hole for use when using a backhoe is drilled near the connection bracket at the tip, and brackets for arm cylinders are set up on the upper and lower surfaces near the base end of the front boom, respectively. Side view with a bucket installed as a work tool, the relay boom that forms the joint boom removed, and the proximal end of the front boom connected to the tip of the main boom with a pin in the pin hole for using the bucket hoe. By forming a dogleg-shaped boom for the backhoe, connecting the base end of the arm for the backhoe to the tip of the front boom, and installing an arm cylinder on the top side of the front boom, the backhoe excavation of the hydraulic excavator is made possible. I configured it so that it can be done.

Function A A long attachment is formed by sequentially connecting work tools such as a joint boom, an arm, and a crusher, and a hydraulic excavator equipped with the long attachment can perform high-altitude work such as demolition of buildings. can.

(b) When you want to replace the long attachment installed as in item A above and perform excavation work with a hydraulic excavator, attach a bucket as a work tool to the tip of the excavator arm, and attach a bucket as a work tool to the end of the excavator arm, and Remove the relay boom forming the main boom, and connect the base end of the front boom to the tip of the main boom with a pin to the pin hole for use with the backhoe to form a boom for the backhoe that is dogleg-shaped when viewed from the side, The proximal end of a backhoe arm is connected to the distal end of the front boom, and an arm cylinder is attached to the upper surface of the front boom. The main boom and front boom are directly connected to form a boxhoe boom that is bent into a dogleg shape when viewed from the side, and an arm cylinder is attached to the top of the front boom, making it possible for the hydraulic excavator to excavate with a boxhoe. can.

Embodiments Hereinafter, embodiments of this invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator equipped with a long attachment having a boom structure according to this invention. In the figure, 14 is the main boom, 15 is the first relay boom, and 16 is the second boom.
The relay boom 17 is a front boom. Second
The figure is a side view of the front boom 17. In the figure, 18 and 19 are connection bosses at the base end of the front boom 17, and 20 and 21 are brackets, respectively. FIG. 3 is a view seen from A in FIG. FIG. 4 is a side view of the main boom 14. In the figure, 22 is a connection bracket;
3, 24, and 25 are pin hole portions, respectively. Fifth
The figure is a plan view seen from B in FIG. 4.

Next, the boom structure according to this invention is shown in Figure 1~
Let us now discuss Figure 5. A pin hole 25 for use when using a backhoe is bored near the connection bracket 22 at the tip of the main boom 14. On the other hand, brackets 20 and 21 for the arm cylinder 12 were provided upright on the upper and lower surfaces near the base end of the front boom 17, respectively. Then, attach a bucket as a work tool to the tip of the arm for the backhoe, remove the relay booms 15 and 16 forming the joint boom, and attach the base end of the front boom 17 to the tip of the main boom 14 to use the backhoe. The front boom 17 is connected to the front boom 17 with a pin to form a dogleg-shaped boom in side view.
The base end of a backhoe arm is connected to the tip of the front boom 17, and the arm cylinder 12 is attached to the upper surface of the front boom 17, thereby making it possible to perform backhoe excavation with a hydraulic excavator.

Next, the functions of the boom according to this invention will be described. As shown in Figure 1, a joint boom,
A long attachment is formed by sequentially connecting an arm and a crusher, and a hydraulic excavator equipped with the long attachment can perform high-altitude work such as demolition of buildings. Figure 6 is a side view of a hydraulic excavator equipped with a hook boom according to this invention and used for backhoe work.When the long attachment in Figure 1 is replaced as shown in Figure 6, Attach a bucket to the tip of the arm, remove the relay booms 15 and 16 that form the joint boom, and connect the base end of the front boom 17 to the tip of the main boom 14 to the pin hole 25 when using a bucket hoe. A boom for the backhoe is formed into a dogleg shape when viewed from the side, and the base end of the arm for the backhoe is connected to the tip of the front boom 17, and the arm cylinder 1
2 to the bracket 2 on the top side of the front boom 17.
0 and attach it to the rear end bracket of the backhoe arm. The main boom 14 and the front boom 17 are directly connected to form a boxhoe boom bent in a dogleg shape when viewed from the side, and the arm cylinder 12 is attached to the top side of the front boom 17, so the hydraulic excavator can be used for backhoe excavation. It can be performed.

Effects of the invention Even if the split main boom and front boom of the conventional long attachment are directly connected, it will be straight, and the arm cylinder cannot be attached to the top side of the front boom, so it is used for the boom for backhoes. I couldn't do it. For this reason, a separate bomb hoe boom was attached during excavation work. Therefore, the long attachment split boom was idle during the excavation work, which was uneconomical.

However, with this invention, when you want to replace the long attachment attached to the front part of the hydraulic excavator and perform excavation work with the hydraulic excavator, you can attach a bucket as a work tool to the tip of the excavator arm. , and remove the relay boom that forms the joint boom, and connect the base end of the front boom to the tip of the main boom with a pin to the pin hole for use in backhoe use to create a dogleg-shaped backhoe boom when viewed from the side. form,
The proximal end of a backhoe arm is connected to the distal end of the front boom, and an arm cylinder is attached to the upper surface of the front boom. The main boom and front boom are directly connected to form a boxhoe boom that is bent into a dogleg shape when viewed from the side, and an arm cylinder is attached to the top of the front boom, making it possible for the hydraulic excavator to excavate with a boxhoe. can. Therefore, the boom can be used for both the long attachment and the backhoe, eliminating the need to remove the main boom. At the same time, the cost of purchasing the boom is reduced, thereby reducing the cost.

[Brief explanation of the drawing]

Figure 1 is a side view of a hydraulic excavator equipped with a long attachment having a boom structure according to this invention, Figure 2 is a side view of a front boom according to this invention, and Figure 3 is a view taken from A in Figure 2. Figure 4 is a side view of the main boom according to this invention.
Figure 5 is a plan view seen from B in Figure 4, Figure 6 is a side view of a hydraulic excavator equipped with the boom according to this invention, and Figure 7 is a side view of a hydraulic excavator equipped with a conventional long attachment. Figure 8 is the 7th
FIG. 9 is a side view of the hydraulic excavator with the relay boom of the long attachment removed, and FIG. 9 is a side view of the hydraulic excavator with the conventional boom for a backhoe attached. 4... Long attachment, 5, 14... Main boom, 6, 7, 15, 16... Relay boom, 8, 17... Front boom, 12... Arm cylinder, 13, 26... Boom for backhoe , 20, 21... Bracket, 22... Connection bracket, 23, 24, 25... Pin hole portion.

Claims (1)

[Scope of utility model registration request] A joint boom, an arm, and a working tool are sequentially connected to the front part of the hydraulic excavator so as to be rotatable in the front and rear directions, and the joint boom includes a main boom on the base end side, one or more relay booms, The main boom has a boom structure in which the front boom on the tip side is fixedly connected in a substantially straight line, and brackets for mounting hydraulic cylinders are provided on the upper and lower sides of the front boom, respectively. A pin hole for use when using a backhoe is drilled near the connection bracket of the front boom, and brackets for arm cylinders are set up on the top and bottom surfaces near the base end of the front boom, respectively, and the tip of the backhoe arm is used as a work tool. Attach the bucket and remove the relay boom that forms the joint boom, and attach the proximal end of the front boom to the tip of the main boom and engage the pin in the pin hole when using the bucket hoe to form a dogleg shape when viewed from the side. By forming a boom for a backhoe, connecting the base end of the arm for the backhoe to the tip of the front boom, and installing an arm cylinder on the top side of the front boom, the hydraulic excavator can perform backhoe excavation. A hydraulic excavator boom structure characterized by the following configurations.